Carrie Underwood performed an a cappella ... clad in a simple, sleeveless dove gray draped midi dress by Opificio Modenese. Styled by longtime collaborator Marina Toybina, Underwood finished ...

But the singer divided fans with her appearance at the historical event. Carrie wowed in chic, grey dress which was a far cry from her famous glitzy onstage outfits as she belted out the tune ...

Carrie Underwood performed an a cappella ... clad in a simple, sleeveless dove gray draped dress. She finished her look with diamond drop earrings, a sparkling bracelet and several rings.